I think that if Bitcoin becomes a centralised private bank (and it probably will) and it does well out f it, you will see more and more crypto currencies follow suit.
Think about that from an investor's point of view - centralised control, someone who is accountable for the money I am investing, is a lot more attractive and a decentralised model where my money is at much higher risk.
So the currencies that will get funding will be the centralised ones. The decentralised ones will be fringe products for anarchists and crypto-geeks. The mass adoption cryptos will be centralised because that's what most people want. They understand centralised. It's not new and scary. So that's where most people will go.
The question for the developers of new blockchain technologies is- are you in it for the money, or to build a better world?
If you're in it for the money, just like a normal bank, then a centralised blockchain is what you want.
The biggest trick, if it can ever be pulled off, would be to have both - a blockchain that regular people understand and are comfortable with, that is not just mining people for money, like a normal bank.
I agree with the fact that there will be two categories of blockchains: private / public ones (already being used by banks for improve their transaction capacity) and decentralized public, which will always be open and independent. They will balance each other and create some sort of equilibrium. In the best scenario, obviously. In the worst scenario, there will be just another Lehman Brothers moment, called SegWit, or whatever.